Chemistry

Question 1

Physical change

Answer 1

No change in particles,just the particle arrangement and energy,easy to reverse e,g.mixing water and salt

Question 2

Chemical change

Answer 2

A chemical reaction takes place and a new substance is formed, very difficult to reverse e.g burning a match

Question 3

During a chemical reaction

Answer 3

The atoms rearrange to form a new substance might be seen by colour change ,temperature change, light being emitted or bubbles

Question 4

Filtration

Answer 4

Used to separale small insoluble solids (do Hot dissolve in a liquid from a liquid be using filter pap and a funnel to trap the solids.

Question 5

Residue

Answer 5

a Residue - the soil left in the filter paper after
filtration
a Filtrate - the clean water that comes after
filtration
a Evaporation - used to separate a soluble solid from a liquid e.g. salt and water
Solvent - the liquid that a solid is dissolved into
Solute - the solid that is left behind after vaporation